User interface for a portion of a display screen



The FIGURE is a front view of a user interface for a portion of a display screen showing our new design.

The broken line drawings of certain elements at the top of the user interface are for illustrative purposes only and forms no part of the claimed design. The areas within those certain elements are not part of the claimed design.

The broken line showing of the display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a user interface for a portion of a display screen, as shown and described. 